How popular is Shirely?

Shirely is a somewhat popular first name for females (#3195 out of 4276, Top 75%) and also a somewhat popular surname for all people (#125639 out of 150436, Top 84%). (2000 U.S. Census)

Which version is better?

with its source form and related girl names. Prominent variation forms of Shirely (not ranked) ranked in the Top 2000 are Sheryl, Shirl, Shirlee, Shirleen, Shirlene, Shirley(#1307 in recent rankings) and Shirly. Other variants, like Sherlie, are seldom used. These relations of Shirely were popular 9 decades ago (median #1083) and are now significantly less conventional (#1901, ▼99.8%). (2015 Birth Statistics)